DevTools.at
Free Online Developer Tools
Your data never leaves your device
Tools
Format, encode, generate, and convert data instantly. No registration, no limits, 100% free.
JSON Formatter
Format, validate, and beautify JSON data
Base64 Encoder/Decoder
Encode and decode Base64 strings
Hash Generator
Generate MD5, SHA-1, SHA-256 hashes
Password Generator
Generate secure random passwords
QR Code Generator
Create QR codes for URLs, text, and more
URL Encoder/Decoder
Encode and decode URL strings
UUID Generator
Generate random UUIDs (v4)
Timestamp Converter
Convert Unix timestamps to dates
Lightning Fast
All tools run locally in your browser
100% Secure
Your data never leaves your device
Always Free
No registration, no limits, no ads
20+ Languages
Available worldwide. Works on desktop, tablet, and mobile.
REST API
REST API for automation and CI/CD pipelines.
Works Offline
Once loaded, tools work even without internet.
Tools
100 tools for encoding, formatting, generating, converting, and more.
Formatters
9JSON Formatter
Format, validate, and beautify JSON data
JSON Viewer
Interactive tree view for JSON data
CSS Minifier
Minify CSS code
HTML Prettifier
Format and beautify HTML code
JavaScript Minifier
Minify JavaScript code
JSON Minifier
Minify JSON by removing whitespace
Markdown Preview
Preview Markdown with live rendering
Phone Formatter
Format phone numbers
SQL Formatter
Format and beautify SQL queries
Encoders & Decoders
12Base64 Encoder/Decoder
Encode and decode Base64 strings
JWT Decoder
Decode and inspect JWT tokens
URL Encoder/Decoder
Encode and decode URL strings
HTML Entities Reference
Complete HTML entities reference
Backslash Escape/Unescape
Escape and unescape backslash sequences
Base32 Encoder/Decoder
Encode and decode Base32 strings
HTML Entity Encoder
Encode and decode HTML entities
JSON Escape/Unescape
Escape and unescape JSON strings
Morse Code Translator
Convert text to Morse code and back
Punycode Converter
Convert between Unicode and Punycode
ROT13 Encoder/Decoder
Apply ROT13 cipher to text
SQL Escape
Escape strings for SQL queries
Generators
29Hash Generator
Generate MD5, SHA-1, SHA-256 hashes
Password Generator
Generate secure random passwords
QR Code Generator
Create QR codes for URLs, text, and more
UUID Generator
Generate random UUIDs (v4)
Random Number Generator
Generate random numbers in a range
.htaccess Generator
Generate Apache .htaccess rules
Fake Data Generator
Generate realistic fake data
Markdown Table Generator
Generate Markdown tables easily
Robots.txt Generator
Generate robots.txt files
Sitemap Generator
Generate XML sitemaps
Regex Generator
Generate regex patterns from examples
Crontab Generator
Generate cron expressions visually
Border Radius Generator
Generate CSS border radius
Box Shadow Generator
Generate CSS box shadows
Gradient Generator
Create CSS gradients visually
Color Palette Generator
Generate color palettes
CSS Grid Generator
Generate CSS Grid layouts
Flexbox Generator
Generate CSS Flexbox layouts
Favicon Generator
Generate favicons from images
Twitter Card Generator
Generate Twitter Card meta tags
Open Graph Generator
Generate Open Graph meta tags
Placeholder Image Generator
Generate placeholder images
Bcrypt Generator
Hash and verify bcrypt passwords
HMAC Generator
Generate HMAC authentication codes
IP Address Generator
Generate random IP addresses
MAC Address Generator
Generate random MAC addresses
Meta Tags Generator
Generate SEO meta tags
Random String Generator
Generate random alphanumeric strings
Slug Generator
Generate URL-friendly slugs
Converters
20Timestamp Converter
Convert Unix timestamps to dates
Color Picker
Pick colors and get codes
Unit Converter
Convert between measurement units
Base Converter
Convert numbers between bases
List to JSON
Convert text lists to JSON arrays
Aspect Ratio Calculator
Calculate image aspect ratios
Binary/Text Converter
Convert between binary and text
Color Converter
Convert between color formats
CSV/JSON Converter
Convert between CSV and JSON
Date Calculator
Calculate date differences and additions
Epoch Batch Converter
Convert multiple timestamps at once
Hex/ASCII Converter
Convert between hexadecimal and ASCII
HTML to Markdown
Convert HTML to Markdown
Image to Base64
Convert images to Base64 data URIs
JSON to TypeScript
Generate TypeScript interfaces from JSON
Number Base Converter
Convert numbers between any base
Number to Words
Convert numbers to written words
Unicode Converter
Convert between text and Unicode codes
XML/JSON Converter
Convert between XML and JSON
YAML/JSON Converter
Convert between YAML and JSON
Text Tools
14Lorem Ipsum Generator
Generate placeholder text
Text Case Converter
Convert text between cases
Whitespace Remover
Remove extra whitespace from text
Text Diff
Find differences between texts
Emoji Picker
Search and copy emoji
Byte Counter
Count bytes and characters in text
Character Map
Browse Unicode character map
Diff Checker
Compare two texts and find differences
Duplicate Line Remover
Remove duplicate lines from text
Line Sorter
Sort lines alphabetically or numerically
Text Repeater
Repeat text multiple times
Text Reverser
Reverse text or words
Text Truncator
Truncate text to a specific length
Word Counter
Count words, characters, and sentences
Developer Tools
16Regex Cheat Sheet
Regular expression quick reference
Keyboard Shortcuts
Common keyboard shortcuts reference
ASCII Table
ASCII character reference table
Chmod Calculator
Calculate Unix file permissions
HTTP Status Codes
HTTP status code reference
IP Lookup
Look up IP address information
CIDR Calculator
Calculate CIDR subnet ranges
Credit Card Validator
Validate credit card numbers
Cron Parser
Parse and explain cron expressions
Email Validator
Validate email addresses
IBAN Validator
Validate IBAN numbers
JSONPath Tester
Test and evaluate JSONPath expressions
JSON Schema Validator
Validate JSON against a schema
Regex Tester
Test regular expressions
Unix Permissions
Unix file permissions reference
User Agent Parser
Parse user agent strings
API Development
- Format & validate JSON/XML
- Encode/decode Base64 & JWT
- Generate UUIDs & test data
Security & Auth
- Secure passwords & hashes
- HMAC & bcrypt generation
- URL encode & SQL escape
Frontend & Design
- CSS gradients & shadows
- Color palettes & favicons
- Flexbox & grid layouts